T cells and sympathetic nerves (IMAGE) Salk Institute Caption Exhausted killer T cells with higher expression of the noradrenaline receptor ADRB1 (cyan) surround sympathetic nerves (yellow) in a virally infected spleen. Killer T cells without ADRB1 (red) do not surround the sympathetic nerves (yellow). Credit Salk Institute Usage Restrictions With credit and related coverage License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.